Casio Ring Watch CRW-001Price, Size, Battery & Features
Last updated
Casio made the CRW-001 for the 50th anniversary of its watches: a full-metal ring with a 6-digit LCD that shows the time down to the second, the date, dual time and a stopwatch. It is a classic digital watch, not a smartwatch, and runs about two years on one button battery with nothing to charge.
Released
Dec 26, 2024
Price
BATTERY
About 2 years, button cell
RING SIZE
US 10.5, spacers for 2 smaller
Comparison
Compare watchesHow it compares
Cost over 3 years
$135 at Casio ($120 at launch)
Device price plus up to three years of optional subscription.
Weight
16g
Grams on your wrist. Lower is lighter.
Battery life
About 2 years on an SR621SW button battery; the battery can be replaced
How long it lasts on its own, away from a charger.
Cost over 3 years
Samsung Galaxy Watch 8$299.99
Pixel Watch 4Google Health Premium costs $9.99 a month. It is optional. Over 3 years that is $360.
A personalized health coach, plus the fuller sleep and readiness analysis and the workout and mindfulness libraries.
Samsung Galaxy Watch 9$379.99
Apple Watch Series 11$399
Apple Watch Series 12$399Weight
Battery life
DeviceOptional subscription
Case only, without a strap, as the maker quotes it.
Battery life can vary based on usage, settings and firmware version.
Quick answers
All FAQsQuick answers
How much does the Casio Ring Watch cost?
Casio's US store lists the CRW-001-1 at $135.00. It launched at $120 in December 2024.
Is the Casio Ring Watch a smartwatch?
No. It is a 3-button digital watch with a 7-segment LCD. It shows the time to the second, the date, dual time and a stopwatch, and it runs on a small button battery.
What ring size is the Casio Ring Watch?
The ring has a 20 mm inner diameter and a 62.8 mm circumference, which fits a US size 10.5 finger. Two spacers bring the inner diameter down to 19 mm or 18 mm. Casio does not resize the ring.
Similar products to consider
1946 · Went on sale
Casio's first product is a ring
Dec 19, 2024 · Announced
Casio announces the CRW-001 Ring Watch
At a glance
THIS PRODUCTCasio Ring Watch
COMPARE WITHApple Watch Series 11Display
6-digit, 7-segment LCD with a white LED backlightConfirmed: Casio · Oct 10, 2026mineral glass
LTPO OLED, 2,000 nitsReported: Apple · Jul 11, 2026
Battery
About 2 years on an SR621SW button batteryConfirmed: Casio · Oct 10, 2026the battery can be replaced
Up to 24 hrsConfirmed: Apple · Jul 11, 2026
Water resistance
Water resistant for everyday useConfirmed: Casio America · Oct 10, 2026
WR50MConfirmed: Apple · Jul 11, 2026IP6X
Price
The starting list price, not a temporary sale price. It is usually the first thing that rules a product in or out.
From $135
$259.99 (regularly $399)
Weight
Weight can matter when something stays on your body for hours at a time.
16gConfirmed: Casio · Oct 10, 2026
29.7–43.1g (by size/material)Confirmed: Apple · Jul 15, 2026
Materials
Titanium and aluminium differ in weight, price and how they wear over years.
Stainless steel case, bezel and ringConfirmed: Casio · Oct 10, 2026face 25.2 × 19.5 × 6.2mm; ring inner diameter 20mm (US 10.5), with spacers for two smaller sizes
Rounded square aluminium/titaniumReported: Apple · Jul 11, 2026
Show 2 more specifications⌄
Blood glucose
No wearable measures glucose on its own yet; some connect to a separate sensor.
Unknown
No
Satellite
Satellite messaging is the feature that matters exactly once, a long way from a cell tower.
Unknown
No
More specs⌄
Processor
The processor affects speed, efficiency and which features the device can support.
Unknown
S10Confirmed: Apple · Jul 11, 2026
Software
Software affects apps, updates and how well the device fits your other products.
Unknown
watchOS 26Confirmed: Apple Newsroom · Jul 11, 2026
Connectivity
Bluetooth, Wi-Fi and other connections determine what the device can work with.
Unknown
5G + Wi-FiConfirmed: Apple · Jul 11, 2026
AI
AI features vary from simple voice help to camera-based assistants.
Unknown
On-device (basic)Reported: Apple · Jul 11, 2026AI Siri needs iPhone
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Frequently asked questions
Questions about Casio Ring Watch CRW-001-1
Top questions
How much does the Casio Ring Watch cost?
Casio's US store lists the CRW-001-1 at $135.00. It launched at $120 in December 2024.
Is the Casio Ring Watch a smartwatch?
No. It is a 3-button digital watch with a 7-segment LCD. It shows the time to the second, the date, dual time and a stopwatch, and it runs on a small button battery.
What ring size is the Casio Ring Watch?
The ring has a 20 mm inner diameter and a 62.8 mm circumference, which fits a US size 10.5 finger. Two spacers bring the inner diameter down to 19 mm or 18 mm. Casio does not resize the ring.
How long does the battery last?
Casio rates it at about 2 years on an SR621SW button battery. The ring is sealed so the battery can still be replaced, and there is nothing to charge.
Is the Casio Ring Watch waterproof?
Casio rates it water resistant for everyday use. It does not give it a depth rating for swimming.
How big and heavy is it?
The face measures 25.2 x 19.5 x 6.2 mm and the whole ring weighs 16 g. The case, case back and ring are one piece of stainless steel.
Does the Casio Ring Watch have a light and an alarm?
Yes. It has a white LED backlight, an alarm with an hourly time signal, and Time Flash, which blinks the light at a time you set and every hour on the hour. The light may not be visible in bright light.
What can the Casio Ring Watch do?
Time to the second in 12 or 24-hour format, an auto-calendar, dual time, world time, an alarm and a 1/100-second stopwatch. Casio rates it accurate to within 30 seconds a month.
Why did Casio make a ring watch?
It marks the 50th anniversary of Casio watches, and the ring shape nods to Casio's first product, the yubiwa finger-ring pipe, sold in 1946.
What comes in the box?
The Ring Watch and two size-adjusting spacers, for a 19 mm and an 18 mm inner diameter.
Using it
What does it cost?
It costs $120. That is the list price.
Does it have GPS?
No, it has no GPS.
How heavy is it?
It weighs 16g.
What is it made of?
It is made of stainless Steel.
Does it take an ECG?
No, it does not take an ECG.
Does it measure blood oxygen?
No, it does not measure blood oxygen.
Does it track heart rate?
No, it does not track your heart rate.
Does it track HRV?
No, it does not track your HRV.
Does it track sleep stages?
No, it does not track sleep stages.
Does it read skin temperature?
No, it does not read your skin temperature.
Will it warn me about an irregular rhythm?
No, it does not watch for that.
Does it count steps?
No, it does not count steps.
Sizing and fit
What sizes does it come in?
Stainless steel case, bezel and ring; face 25.2 x 19.5 x 6.2 mm; ring inner diameter 20 mm (US 10.5), with spacers for two smaller sizes.
Price and models
Is there a newer one?
No. The Casio Ring Watch CRW-001-1 is the current model.